What kind of piece is this? Emboss says "(c)2003 The LEGO Group" and there is a 4303 number below. I browsed Peeron a little but didn't find anything similar.
There are two red handles, one rotates ...

I know that LEGO bricks have changed over the years, with regards to moulding pip locations, element i.d. numbers printed inside etc, but I was wondering if anyone knows when these changes happened?
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What is the piece that holds the pant legs together called? Is there an "official1" name? Or is there just a commonly agreed on term?
1Official meaning something mentioned, even in passing, by Lego ...

I remember owning a very strange Lego set, but have forgotten the name.
The pieces were similar to Technic parts, but different. They were green rounded frames and connected using purple squares with ...

Some bricks, such as the Erling brick, seem to have common nicknames in the LEGO building community. As the basic 2 x 4 brick appears to be the foundation of the system, it is reasonable to suppose ...

I've recently found this grey keyhole-shaped piece - there are a fair number of them that stack together to form a circular staircase. There is what looks like a part number on the bottom but it is ...

I had a set similar to this when I was younger (I am fairly sure this was before the year 2000), although:
The model was red, rather than yellow.
The model was more of a breakdown truck, rather than ...

This is a very popular picture, which almost all Lego Trains' fans from 1980s would recognize.
I have the train in the forground, 7740, but not the 4th car (red one). Can anyone please clarify that ...

I've come across some trees from some bulk purchases I've made, and I can not determine if these are LEGO or "compatible" parts. Any ideas? The tree on the left is an official tree but the one in the ...

My son recently got a huge box of figures and pieces (from what I can tell an original spaceship wih figure too) and I can't figure out what set is from or how old this figure is. Any help would be ...

I've been sieving through my video collection and came across a video from 2011. It's part of a series of Ninjago videos giving you tips on fun things you could do with the Spinners. At the end of the ...

Our family (with very big hearts) gave us some lego they found.
But... I do not know what sets they are from. I already identified 11 sets, but cannot find the last 4 (I think)
Could you please help?
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Can I buy Technic sets that are just assortments of parts as opposed to a specific vehicle?
Background
I do research on sediment carbon cycling in lakes and I need use a rotating array of magnets to ...

We have these little black Technic pieces that connect together; they make a track that fits over the gears (sort of like wheeled-belt-track on excavators or tank track).
Can you tell me the name of ...

I bought a tin of old Lego second hand - most of the pieces date from the 70s and very early 80s. These definitely say Lego on them. They may be damaged. I cannot find them on other brick identifier ...

I bought some second-hand Lego and it's a total mish-mash of parts. There was a small quantity of Mega-Bloks in it, but those parts always seem easy to identify. However, I'm stumped about this piece ...

My husband collects the Marvel figures which come in the Mega Bloks blind bags. His birthday is coming up and I'd like to build him a display for his Marvel figures. I'd strongly prefer to use LEGO in ...